mirror of
https://github.com/janet-lang/janet
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Work in progress - more socket functions
When this is complete we'll have getpeername, getsockname and possibly getpeerid in the net/* API.
This commit is contained in:
llmII
parent
7037532943
commit
ba761d5c35
213
src/core/net.c
213
src/core/net.c
@ -29,6 +29,7 @@
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#ifdef JANET_NET
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#include <math.h>
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#include <arpa/inet.h>
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#ifdef JANET_WINDOWS
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#include <winsock2.h>
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#include <windows.h>
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@ -570,6 +571,217 @@ JANET_CORE_FN(cfun_net_listen,
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}
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}
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#define SO_MAX(a, b) (((a) > (b))? (a) : (b))
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#define SA_PORT_NONE (&(in_port_t){ 0 })
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#define SO_MIN(a, b) (((a) < (b))? (a) : (b))
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#define SA_ADDRSTRLEN SO_MAX(INET6_ADDRSTRLEN, (sizeof ((struct sockaddr_un *)0)->sun_path) + 1)
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#define sa_ntoa(sa) sa_ntoa_((char [SA_ADDRSTRLEN]){ 0 }, SA_ADDRSTRLEN, (sa))
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#define sa_aton(str) sa_aton_(&(struct sockaddr_storage){ 0 }, sizeof (struct sockaddr_storage), (str))
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#define sa_family(...) sa_family(__VA_ARGS__)
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#define sa_port(...) sa_port(__VA_ARGS__)
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union sockaddr_arg {
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struct sockaddr *sa;
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const struct sockaddr *c_sa;
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struct sockaddr_storage *ss;
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struct sockaddr_storage *c_ss;
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struct sockaddr_in *sin;
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struct sockaddr_in *c_sin;
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struct sockaddr_in6 *sin6;
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struct sockaddr_in6 *c_sin6;
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struct sockaddr_un *sun;
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struct sockaddr_un *c_sun;
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union sockaddr_any *any;
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union sockaddr_any *c_any;
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void *ptr;
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void *c_ptr;
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};
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union sockaddr_any {
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struct sockaddr sa;
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struct sockaddr_storage ss;
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struct sockaddr_in sin;
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struct sockaddr_in6 sin6;
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struct sockaddr_un sun;
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};
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static inline union sockaddr_arg sockaddr_ref(void* arg) {
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return (union sockaddr_arg){ arg };
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}
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static inline sa_family_t *(sa_family)(void* arg) {
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return &sockaddr_ref(arg).sa->sa_family;
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}
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static inline in_port_t *(sa_port)(void* arg, const in_port_t *def, int *error) {
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switch (*sa_family(arg)) {
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case AF_INET:
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return &sockaddr_ref(arg).sin->sin_port;
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case AF_INET6:
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return &sockaddr_ref(arg).sin6->sin6_port;
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default:
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if (error)
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*error = EAFNOSUPPORT;
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return (in_port_t *)def;
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}
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}
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size_t janet_socket_strlcpy(char *dst, const char *src, size_t lim) {
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char *d = dst;
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char *e = &dst[lim];
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const char *s = src;
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if (d < e) {
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do {
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if ('\0' == (*d++ = *s++))
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return s - src - 1;
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} while (d < e);
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d[-1] = '\0';
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}
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while (*s++ != '\0')
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;;
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return s - src - 1;
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}
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char *sa_ntop(char *dst, size_t lim, const void *src, const char *def, int *_error) {
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union sockaddr_any *any = (void *)src;
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const char *unspec = "0.0.0.0";
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char text[SA_ADDRSTRLEN];
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int error;
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switch (*sa_family(&any->sa)) {
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case AF_INET:
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unspec = "0.0.0.0";
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if (!inet_ntop(AF_INET, &any->sin.sin_addr, text, sizeof text))
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goto syerr;
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break;
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case AF_INET6:
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unspec = "::";
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if (!inet_ntop(AF_INET6, &any->sin6.sin6_addr, text, sizeof text))
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goto syerr;
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break;
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case AF_UNIX:
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unspec = "/nonexistent";
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memset(text, 0, sizeof text);
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memcpy(text, any->sun.sun_path, SO_MIN(sizeof text - 1, sizeof any->sun.sun_path));
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break;
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default:
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error = EAFNOSUPPORT;
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goto error;
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}
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if (janet_socket_strlcpy(dst, text, lim) >= lim) {
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error = ENOSPC;
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goto error;
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}
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return dst;
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syerr:
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error = errno;
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error:
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if (_error)
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*_error = error;
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/*
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* NOTE: Always write something in case caller ignores errors, such
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* as when caller is using the sa_ntoa() macro.
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*/
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safe_memcpy(dst, (def)? def : unspec, lim);
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return (char *)def;
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}
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void *sa_pton(void *, size_t, const char *, const void *, int *);
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static inline char *sa_ntoa_(char *dst, size_t lim, const void *src) {
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return sa_ntop(dst, lim, src, NULL, &(int){ 0 }), dst;
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}
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/*
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static inline void *sa_aton_(void *dst, size_t lim, const char *src) {
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return sa_pton(dst, lim, src, NULL, &(int){ 0 }), dst;
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}
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*/
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static JanetString janet_name_from_socket(const struct sockaddr_storage *ss, socklen_t slen) {
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uint8_t *hn = NULL;
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uint16_t hp = 0;
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size_t plen = SA_ADDRSTRLEN;
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switch(ss->ss_family) {
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case AF_INET:
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/* fall through */
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case AF_INET6:
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/* hn = hostname, hp = hostport */
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hn = (uint8_t *)sa_ntoa(ss);
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hp = ntohs(*sa_port((void *)ss, SA_PORT_NONE, NULL));
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break;
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case AF_UNIX:
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/* support nameless sockets, linux-ism */
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if (slen > offsetof(struct sockaddr_un, sun_path)) {
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struct sockaddr_un *sun = (struct sockaddr_un *)ss;
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char *pe = (char *)sun + SO_MIN(sizeof *sun, slen);
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size_t plen;
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while (pe > sun->sun_path && pe[-1] == '\0')
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--pe;
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if ((plen = pe - sun->sun_path) > 0) {
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hn = (uint8_t *)sun->sun_path;
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} else {
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hn = (uint8_t *)"@";
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plen = 1;
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}
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} else {
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hn = (uint8_t *)"@";
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plen = 1;
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}
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break;
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default:
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hn = (uint8_t *)"";
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plen = 0;
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break;
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}
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return janet_string(hn, plen + 1);
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}
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JANET_CORE_FN(cfun_net_getpeername,
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"(net/peername stream)",
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"Document me!") {
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janet_arity(argc, 1, 1);
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JanetStream *js = janet_getabstract(argv, 0, &janet_stream_type);
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struct sockaddr_storage ss;
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socklen_t slen = sizeof ss;
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memset(&ss, 0, slen);
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int error;
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if (0 != (error = getpeername(js->handle, (struct sockaddr *)&ss, &slen))) {
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janet_panicf("Failed to get peername on fd %d, error: %s", js->handle, janet_ev_lasterr());
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}
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JanetString ret = janet_name_from_socket(&ss, slen);
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return janet_wrap_string(ret);
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}
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JANET_CORE_FN(cfun_stream_accept_loop,
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"(net/accept-loop stream handler)",
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"Shorthand for running a server stream that will continuously accept new connections. "
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@ -739,6 +951,7 @@ void janet_lib_net(JanetTable *env) {
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JANET_CORE_REG("net/flush", cfun_stream_flush),
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JANET_CORE_REG("net/connect", cfun_net_connect),
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JANET_CORE_REG("net/shutdown", cfun_net_shutdown),
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JANET_CORE_REG("net/peername", cfun_net_getpeername),
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JANET_REG_END
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};
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janet_core_cfuns_ext(env, NULL, net_cfuns);
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